EP0127202A2 - Verfahren und Anlage zum Entwässern und zur Umwandlung einer Mischung aus Wasser und einer Paste in Granulat - Google Patents

Verfahren und Anlage zum Entwässern und zur Umwandlung einer Mischung aus Wasser und einer Paste in Granulat Download PDF

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Publication number
EP0127202A2
EP0127202A2 EP84200354A EP84200354A EP0127202A2 EP 0127202 A2 EP0127202 A2 EP 0127202A2 EP 84200354 A EP84200354 A EP 84200354A EP 84200354 A EP84200354 A EP 84200354A EP 0127202 A2 EP0127202 A2 EP 0127202A2
Authority
EP
European Patent Office
Prior art keywords
enclosure
granules
tank
mixture
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84200354A
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English (en)
French (fr)
Other versions
EP0127202A3 (de
Inventor
Jean Secail
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Francaise Des Micro-Rayonnements Societ Cie
Original Assignee
FRANCAISE DES MICRO-RAYONNEMENTS FRANCAISE Cie SA
Francaise Des Micro-Rayonnements Francaise Cie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FRANCAISE DES MICRO-RAYONNEMENTS FRANCAISE Cie SA, Francaise Des Micro-Rayonnements Francaise Cie SA filed Critical FRANCAISE DES MICRO-RAYONNEMENTS FRANCAISE Cie SA
Publication of EP0127202A2 publication Critical patent/EP0127202A2/de
Publication of EP0127202A3 publication Critical patent/EP0127202A3/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C1/00—Apparatus or methods for obtaining or processing clay
    • B28C1/02—Apparatus or methods for obtaining or processing clay for producing or processing clay suspensions, e.g. slip
    • B28C1/06—Processing suspensions, i.e. after mixing
    • B28C1/08—Separating suspensions, e.g. for obtaining clay, for removing stones; Cleaning clay slurries
    • B28C1/082—Dewatering ; Using sieves

Definitions

  • the invention relates to a method and an installation for dehydrating and converting a mixture of water and paste into granules; it applies in particular for the dehydration and the transformation into granules of slip formed by a mixture of water and ceramic clay in particular.
  • One of the techniques for manufacturing ceramic products (tiles, etc.), said by the wet method, consists in grinding the clay and the various constituents in an aqueous medium so as to obtain a homogeneous liquid mixture, called "slip".
  • This wet technique is preferred to the dry techniques (consisting in mixing the products in the pulverulent dry state) because it allows easier and more homogeneous integration of the various constituents in the base clay .
  • Slips generally have a humidity level (weight ratio: liquid / dry matter) of the order of 50%.
  • this product is in the form of roughly spherical granules.
  • the present invention proposes to indicate a new dehydration process making it possible to obtain dehydrated granules from a mixture of water and paste; in the context of the above-mentioned application (dehydration of slip), the invention aims to make it possible to obtain spheroid granules having a moisture content substantially between 6% and 16% which can either be the subject additional drying, or be directly pressed.
  • an essential objective of the invention is to provide a process which, at the same time, consumes little energy and requires only reduced labor.
  • hot compressed air is injected into the enclosure, which increases the dehydration of the pasty deposits, accelerates the evacuation of the liquid residue and facilitates the detachment of deposits from filtering surfaces.
  • the granules are advantageously subjected to the action of a flow of hot air which is caused to flow against the current of the granules from the base of the tubular surface towards its upper part. ; this action can advantageously be combined with the action of microwave electromagnetic radiation to which the granules are subjected inside the tubular surface.
  • phases (a), (b) and (c) are advantageously implemented so as to obtain, at the end of these phases, clods having a moisture content (liquid weight ratio / dry matter) substantially between 18 and 20%. It has been observed that this humidity rate allows, during the following phases (d) and (e), an easy division of the clods into particles and an easy modeling of these to obtain granules of regular spheroid forms.
  • the flow of hot air and / or the microwave radiation provided for in phase (e) can be adjusted to obtain granules having a final humidity level of between 6% and 16%.
  • the granules can then be either directly pressed, either undergo additional drying in a conventional microwave and / or hot air dryer to precisely reach the humidity level required by pressing (of the order of 6 to 7%).
  • the method of the invention thus makes it possible overall to obtain an excellent energy balance and provides granules which are easy to handle by any means (worm, carpet ...) without risk of agglomeration.
  • the installation shown as an example in the figures is intended to treat liquid clay slurries with a humidity level of the order of 50% with a view to transforming them into spheroid granules with adjustable humidity between 6 and 16%. .
  • This installation includes essential Lement, as shown schematically in Figure 1, two filtration devices 1 and 2 arranged in parallel, a stripping device 3 located below the devices 1 and 2, a hopper 4 arranged to receive the clods at the outlet of the devices 1 and 2 and to guide them to the device 3, a granulation device 5 located near the demoding device 3 and a chute 6 guiding the particles to the granulation device 5 at the outlet of this device 3.
  • the two filtration devices are called, as will be explained below, to work in alternative sequences so as to deliver at their outlet an almost continuous clod flow.
  • Each filtration device comprises a closed cylindrical enclosure 7, extending along a vertical axis XX '.
  • This enclosure is closed in the lower part by a horizontal wall 8 pierced with a large lumen surrounded by a duct 9 for evacuation of clods; this conduit is associated with a guillotine valve 18 of the conventional type, the conduits 9 of the two filtration devices emerging at the top of the hopper 4.
  • a tubular shaft 10 which is rotatably mounted and can be driven by means of conventional transmission means 11 by an electric motor 12; these means and this motor are adapted so as to make it possible to adjust the speed of rotation of the shaft 10 within a range extending between 10 and 120 revolutions / min (to simplify FIG. 2, the bearings which guide the lower part tree 10 were not shown).
  • the shaft 10 carries a series of superimposed plates 13 separated from each other at the central part by spacer rings 14. The circular periphery of each plate is located opposite and at a certain distance from the cylindrical wall 7a of the enclosure 7. In the lower part, the shaft 10 carries a scraper 15 which is able to rotate with it and extends over the entire diameter of the enclosure, against the bottom wall 8.
  • Each plate 13 carries on its upper face a set of radial grooves 13a and concentric circular grooves 13b; the radial grooves 13a are closed in the vicinity of the circular periphery of the plate and, on the contrary, opens out at the central part inside the hollow shaft 10 through slots 10a which the latter comprises.
  • Each plate 13 is surmounted by a filter cloth 16 which is fixed around it by a strapping 17 and is pinched in the center by the spacer rings 14.
  • the plates are shaped so that the filter cloths 16 are very slightly inclined towards their periphery.
  • the hollow shaft 10 opens at the bottom into a conduit 19 for discharging the filtrate, provided with a valve 20.
  • the bottom wall 8 of the enclosure is pierced with a lumen surrounded by a drain conduit 21 which allows to evacuate, at each sequence, the liquid balance contained in the enclosure; this duct is provided with a valve 22.
  • the enclosure 7 comprises in the upper part a conduit 23 provided with a three-way valve 24 which makes it possible either to admit pressurized slurries arriving via a conduit 25 associated with a pump 26 (pressure included between 10 and 20 bars), or to inject compressed air into said enclosure (in particular dry hot air as will be seen below) arriving via a conduit 27 (air pressure between 1 and 10 bars).
  • the demoding device 3 to which the lumps are sent at the outlet of the filtration devices 1 and 2 comprises a cylindrical enclosure 28 of inclined axis which is open at its upper part 28a and is fixed by flanges to the base of the hopper 4.
  • This enclosure is laterally provided with a chute 29 for discharging particles.
  • This motor is adapted to allow the speed of rotation of the tank to be adjusted in a range extending between 1000 and 3000 rpm.
  • the tank 30 is carried by the shaft 31 by means of a lower wall which closes it, by means of a conventional assembly.
  • Said tank open on its upper face, is provided on its cylindrical surface with a multitude of calibrated holes such as 30a through which the clods are called to pass, in order to generate their division into particles.
  • three fixed scrapers are associated with said tank along three generators thereof; two scrapers 33 and 34 are arranged inside the rotating tank so as to force the material (pressed against the internal surface of the tank by centrifugal effect) to pass through the holes thereof, while a scraper 35 is arranged outside the tank, slightly downstream of the discharge chute 29 (relative to the direction of rotation of the tank), so as to ensure complete detachment of the particles having passed through the holes 30a.
  • the chute 29 which receives these particles, pours them into the chute 6 already mentioned, which directs them towards the granulation device 5.
  • This granulation device comprises a cylindrical enclosure 36 of elongated shape and of axis YY 'inclined relative to the horizontal by about 20 °.
  • This enclosure impermeable to microwave waves is rotatably mounted around its axis YY ', thanks to two external tires such as 37 which rest on rollers 38 mounted rotating by means of bearings 39, around axes parallel to the axis YY '.
  • the enclosure 36 is externally equipped with a toothed wheel 40 engaged with an output pinion of a gear motor 41.
  • the wheel 40, its drive pinion and the gear motor are adapted to allow the adjustment of the enclosure rotation speed in a range between about 5 and 30 rpm.
  • the enclosure 36 internally comprises a tubular drum 42 which has a diameter less than this and extends around the same axis along said enclosure.
  • This drum has a lower section 42a of smaller diameter.
  • the drum 42 is made of a transparent material or little absorbent against waves electromagnetic microwave, in particular, glass, polytetrafluoroethylene, polyvinyl chloride ... It is fixed in the enclosure by a baffle 43 which forms a spacer and has the shape of a spiral wound between the enclosure and the drum from the part up to the bottom of the device. This chicane thus delimits for the pellets a spiral path between the enclosure and the drum.
  • the drum 42 has internally in its lower section 42a baffles 44 intended to generate turbulence in the air flow.
  • the drum 42 is pierced with a multitude of calibrated holes such as 42b of diameter greater than those of the tank 30 of the demoulding device.
  • the enclosure 36 fits into a lower housing 45 which is equipped with a hot and dry air inlet duct 46.
  • a chute 47 for discharging the granules is subject to said housing; this chute receives the granules after passage through a perforated sheet which extends the enclosure 36; it sends them to a conveyor 48 intended to convey them to subsequent processing stations. Products that are possibly poorly formed or of non-compliant sizes are evacuated for recycling by a chute 49.
  • the enclosure 36 fits into an upper box 50 which is equipped with an air suction duct 51.
  • the chute 6 already mentioned crosses the housing 50 so as to pour the particles into the drum 42 which is open at its upper face 42c.
  • a microwave generator 52 is disposed in the vicinity of this housing 50 and is equipped with an applicator 53 which passes through the housing 50 and continues in the upper part of the drum 42 parallel to the axis thereof.
  • This applicator consists of a waveguide adapted to irradiate the interior volume of the enclosure 36.
  • the power of the generator 52 can be of the order of a few kilowatts, in particular adjustable around a value of 5 Kwatts.
  • Each filtration device 1 or 2 operates in three successive sequences.
  • the pressurized slip mixture having a humidity level of the order of 50% is delivered to enclosure 1 of the device, for example at a pressure of the order of 15 bars.
  • the guillotine valve 18 and the discharge valve 22 are closed and the enclosure is filled.
  • the valve 20 is open and the conduit 19 is at atmospheric pressure: under the effect of the pressure difference, the liquid filters through the filter cloths 16 of the plates; the filtrate is discharged through the tubular shaft 10 (in the stationary state).
  • a deposit of increasing thickness occurs on the filter cloths.
  • the second phase of the process is implemented after a certain time which can be of the order of 15 to 30 min to correspond to a thickness deposit of the order of 5 to 15 mm.
  • the arrival of the slip is stopped by turning the valve 24 so as to admit the dry compressed air coming from the duct 27.
  • This dry compressed air is in particular admitted at a pressure of between 1 and 10 bars and at a temperature between 30 ° C and 60 ° C.
  • the valve 22 is open and the liquid residue from the enclosure is evacuated through the conduit 21; compressed air accelerates this expulsion.
  • the deposits present on the plates 13 are projected by centrifugal effect against the cylindrical walls 7a of the enclosure 7 and break to fall back down in the form of clods.
  • the dry and hot compressed air helps this expulsion of deposits and accentuates their dehydration.
  • the conditions for implementing the three phases described above are adapted in the case of slips, so that the humidity level of the lumps is at the outlet of the order of 16 to 20%; this rate is easily obtained in practice by adjusting the parameters for entering the dry and hot compressed air within the above-mentioned ranges and appropriately adapting the duration of the first phase.
  • the parallel devices 1 and 2 work in alternating sequences: the first phase is accomplished for one of them, while the second and third phases are accomplished for the other. An almost continuous flow of clods is thus sent to the demoding device 3.
  • the clods expelled from the filtration devices 1 and 2 are treated in a fourth phase in said demoulding device 3. They arrive in the rotating tank 30 and are brought by the combined effect of the centrifugal force and the scrapers to pass through. calibrated holes in this tank.
  • the particles roll in the rotating drum 42 which is the seat of a turbulent air flow circulating against the current with respect to the direction of circulation of the particles.
  • the shape of these becomes regularized and becomes spheroid; they then pass through the calibrated holes of the drum 42 and roll between the latter and the enclosure in the space in the form of a spiral delimited by the baffle 43.
  • the particles reach the bottom of the enclosure with almost spherical shapes and a reduced rate of hydration by the combined effect of microwave electromagnetic radiation (irradiated by the applicator 53) and the flow of hot and dry air circulating at against the current.
  • the temperature of this air flow is adjusted in a range between 60 and 120 °; this setting and that of irradiated electromagnetic power make it possible to obtain granules at the desired humidity level, between 16% and 6%.
  • the above-mentioned process can be automated by automatic control of the various valves. It dehydrates the slip and transforms it into spherical granules under remarkable saving conditions, both in terms of labor and in terms of energy consumption.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Drying Of Solid Materials (AREA)
  • Glanulating (AREA)
EP84200354A 1983-03-25 1984-03-13 Verfahren und Anlage zum Entwässern und zur Umwandlung einer Mischung aus Wasser und einer Paste in Granulat Withdrawn EP0127202A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8305096 1983-03-25
FR8305096A FR2546513B3 (fr) 1983-03-25 1983-03-25 Ensemble de sechage et pulverisation pour barbotines argileuses ou kaoliniques

Publications (2)

Publication Number Publication Date
EP0127202A2 true EP0127202A2 (de) 1984-12-05
EP0127202A3 EP0127202A3 (de) 1986-08-27

Family

ID=9287324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84200354A Withdrawn EP0127202A3 (de) 1983-03-25 1984-03-13 Verfahren und Anlage zum Entwässern und zur Umwandlung einer Mischung aus Wasser und einer Paste in Granulat

Country Status (3)

Country Link
EP (1) EP0127202A3 (de)
ES (1) ES8503634A1 (de)
FR (1) FR2546513B3 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB823828A (en) * 1956-11-09 1959-11-18 Ciments D Obourg An improved method and apparatus for filtering or screening thick sludges, for example raw cement slurries
DE2615868A1 (de) * 1975-04-16 1976-10-21 Uop Inc Verfahren zur herstellung kugeliger tonerdeteilchen
FR2382930A1 (fr) * 1977-03-12 1978-10-06 Kanesa Miso Kk Procede et appareillage pour mettre a l'etat granuleux des matieres hydratees, y compris des produits alimentaires
GB2007584A (en) * 1977-11-08 1979-05-23 Simon Process Contacting Ltd Improvements in or Relating to Pelletising
SU862967A2 (ru) * 1973-06-01 1981-09-15 Предприятие П/Я А-1297 Мельница-гранул тор

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB823828A (en) * 1956-11-09 1959-11-18 Ciments D Obourg An improved method and apparatus for filtering or screening thick sludges, for example raw cement slurries
SU862967A2 (ru) * 1973-06-01 1981-09-15 Предприятие П/Я А-1297 Мельница-гранул тор
DE2615868A1 (de) * 1975-04-16 1976-10-21 Uop Inc Verfahren zur herstellung kugeliger tonerdeteilchen
FR2382930A1 (fr) * 1977-03-12 1978-10-06 Kanesa Miso Kk Procede et appareillage pour mettre a l'etat granuleux des matieres hydratees, y compris des produits alimentaires
GB2007584A (en) * 1977-11-08 1979-05-23 Simon Process Contacting Ltd Improvements in or Relating to Pelletising

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Section Chimie, semaine E 27, 18 août 1982, abrégé no. 56834 J04, Derwent Publications Ltd., London, GB; & SU-A-862 967 (KOZMEVNIKOV I.P.) 18-09-1981 *

Also Published As

Publication number Publication date
ES530885A0 (es) 1985-03-16
ES8503634A1 (es) 1985-03-16
FR2546513A1 (fr) 1984-11-30
EP0127202A3 (de) 1986-08-27
FR2546513B3 (fr) 1986-01-03

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